Yes most schnauzers do get along good with other dogs.
The miniature schnauzer is one of the dog breeds that does get along good with other small dogs as well as some larger dogs.
Sometimes it can take awhile for a schnauzer or miniature schnauzer to get used to being around other dogs so if you do have other dogs and want to get a schnauzer or miniature schnauzer then just be aware that it might take a bit of time for them to get along.
Some of them get along right away and then some of them take a few months or so to get used to each other and then get along which each other.
My mom has a schnauzer and a larger dog and they both get along and play really good just fine although at first they fought.
It just takes some time and eventually they will get used to each other.